Originally Posted by BFG
Would i have to buy a new rear derailleur to replace the Alivio item that's already on there? Or front deraileur for that matter? They cost a bit.
You won't need a new FD, but a new FD might minimize some chain rubbing unless you know bike mechanics.
I think you do need a new RD because the Alivio is 8s and will not work for a 9s shifter. The next step up in the Shimano line would be Deore which is 9s and you can get those for maybe $25-$35.
Oh also, get new cables and housing while you are at it to optimize shifting.